Question

Which of these statements is correct regarding genes present on the same chromosome?

• A. Tightly linked genes on the same chromosome show very few recombinations
• B. Tightly linked genes on the same chromosomes show higher recombinations
• C. Genes far apart on the same chromosome show very few recombinations
• D. Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.

Answer 1

Answer: (A)

Genes located on the same chromosome and have a greater tendency to be inherited together are called tightly linked genes. The distance between these genes is very less and hence there is very little chance of crossing over. Thus they show very few recombinations. Loosely linked genes have a greater distance between them and hence there is a greater chance of crossing over. Thus they show many recombinations.